On August 2, a representative of JYP Entertainment stated, "The song 'Good Day', written, composed, and sung by Suzy, will be played during the last few episodes of KBS2 Wednesday-Thursday drama 'Uncontrollably Fond'. The official release is scheduled for the end of August." 

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The label continued, "She finished recording in May before the airing of the drama. Suzy was delighted to participate after the director asked that she write an OST portraying No Eul's character." 

We can't wait to hear Suzy's first ever self-composition!